Definition of malignant

• a. - Disposed to do harm, inflict suffering, or cause distress; actuated by extreme malevolence or enmity; virulently inimical; bent on evil; malicious.
• a. - Characterized or caused by evil intentions; pernicious.
• a. - Tending to produce death; threatening a fatal issue; virulent; as, malignant diphtheria.
• n. - A man of extrems enmity or evil intentions.
• n. - One of the adherents of Charles L. or Charles LL.; -- so called by the opposite party.